AKAI AMX6 POWER MIXER AMPg 1 - HI/MID/LOW EQUALIZER: Powerful 15dB boost or cut allows you to tailor the sound of each individual channel so the instrument blends more naturally in the mix. The HIGH EQ is a 12 kHz shelving type to add or cut "sizzle". MID has a center frequency of 1.2 kHz, approximately in the vocal range. The LOW EQ is an 80 Hz shelving type, around the kick-drum frequency. 2 - EFFECT SEND (REV/FX): Controls the level of the signal sent to the internal digital effects and the FX SEND bus. This control comes after the LEVEL control, so the signal sent to internal or external effects will also be affected by changes in the LEVEL setting. 3 - MONITOR: Controls the level of the signal sent to the MONITOR bus and MONITOR OUT jack. This control is independent of the LEVEL control and is not affected by it. This means you can create a completely separate mix for on-stage monitoring. Pre owed missing front cover including power cord. Works perfectly